Raleigh Choppers (not strictly a motor, but they do crop up regularly)

JIGSAW (16:57 minutes into the episode)
At the end of a montage of cross faded shots which follow Regan & Carter on a search, there's a quick shot of a
kid standing next to his red Chopper. Then the squad car comes screeching round the corner.

SELECTED TARGET (36:45 to 37:00 minutes into the episode)
Carter walks up the path of the stylish 70s bungalow, Bray Gate. His beige flares are flapping in a light summer
breeze as the lovely Maureen Lipman looks on from over the road. On the grass is a yellow bike and this is either
a Chopper or a Chipper.

ON THE RUN (43:47 to 44:14 minutes into the epsiode)
A very 70s looking kid rides a purple Chopper in some woods and finds Tim Cook's jeep hidden under the branches.
There may even be a red Chopper on the ground.

DRAG ACT (21:35 to 21:43, 21:50 to 21:54 & 22:02 to 22:05 minutes into the episode)
A paper boy is seen delivering papers riding a red Chopper as Julie Kingdom looks on. He also rides by when
Julie Kingdom's colleague is smudging the fat villain.

TRUST RED (10:12 minutes into the episode)
A blue Chopper is parked up on its stand in the yard where Red's wife is hanging out the washing. Probably
belongs to the elder of Red's two daughters.

FEET OF CLAY (31:02 minutes into the episode)
Ember parks the VW Beetle with the poppy in a car park. In the background is an area of grass by a playground.
It looks like there's a Chopper parked amongst a few other bikes.

Thanks to Adrian for this definitive list of appearances.
Any additions or corrections, please send them in.